| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <48DDE05A.7090403@rs.jp.nec.com>
Date: Sat, 27 Sep 2008 16:27:22 +0900
From: Akira Fujita <a-fujita@...jp.nec.com>
To: linux-ext4@...r.kernel.org
CC: linux-fsdevel@...r.kernel.org
Subject: [RFC][PATCH 12/12]ext4: online defrag command
ext4: online defrag -- Online defrag command
From: Akira Fujita <a-fujita@...jp.nec.com>
- The defrag command. Usage is as follows:
- Put the multiple files closer together.
# e4defrag -r directory-name
- Defrag for free space fragmentation.
# e4defrag -f file-name
- Defrag for a single file.
# e4defrag file-name
- Defrag for all files on ext4.
# e4defrag device-name
Signed-off-by: Akira Fujita <a-fujita@...jp.nec.com>
Signed-off-by: Takashi Sato <t-sato@...jp.nec.com>
---
/*
* e4defrag.c - ext4 filesystem defragmenter
*
* Copyright (C) 2008 NEC Software Tohoku, Ltd.
*
* Author: Akira Fujita <a-fujita@...jp.nec.com>
* Takashi Sato <t-sato@...jp.nec.com>
*/
#ifndef _LARGEFILE_SOURCE
#define _LARGEFILE_SOURCE
#endif
#ifndef _LARGEFILE64_SOURCE
#define _LARGEFILE64_SOURCE
#endif
#define _XOPEN_SOURCE 500
#define _GNU_SOURCE
#include <ftw.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <dirent.h>
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/statfs.h>
#include <sys/vfs.h>
#include <sys/ioctl.h>
#include <mntent.h>
#include <linux/fs.h>
#include <ctype.h>
#include <sys/syscall.h>
#include <sys/mman.h>
#include <ext2fs/ext2_types.h>
/* Ioctl command */
#define EXT4_IOC_DEFRAG _IOW('f', 15, struct ext4_ext_defrag_data)
#define EXT4_IOC_FIBMAP _IOW('f', 16, ext4_fsblk_t)
#define EXT4_IOC_GROUP_INFO _IOW('f', 17, struct ext4_group_data_info)
#define EXT4_IOC_FREE_BLOCKS_INFO _IOW('f', 18, struct ext4_extents_info)
#define EXT4_IOC_FIEMAP_INO _IOW('f', 19, struct fiemap_ino)
#define EXT4_IOC_RESERVE_BLOCK _IOW('f', 20, struct ext4_extents_info)
#define EXT4_IOC_MOVE_VICTIM _IOW('f', 21, struct ext4_extents_info)
#define EXT4_IOC_BLOCK_RELEASE _IO('f', 22)
#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
/* Macro functions */
#define PRINT_ERR_MSG(msg) fprintf(stderr, "%s\n", (msg));
#define PRINT_FILE_NAME(file) fprintf(stderr, "\t\t \"%s\"\n", (file));
#define min(x, y) (((x) > (y)) ? (y) : (x))
/* Wrap up the free function */
#define FREE(tmp) \
do { \
if (tmp) \
free(tmp); \
} while (0) \
/* Insert list2 after list1 */
#define insert(list1, list2) \
do { \
list2->next = list1->next; \
list1->next->prev = list2; \
list2->prev = list1; \
list1->next = list2; \
} while (0)
#ifndef __NR_fadvise64
#define __NR_fadvise64 250
#endif
#ifndef __NR_sync_file_range
#define __NR_sync_file_range 314
#endif
#ifndef POSIX_FADV_DONTNEED
#if defined(__s390x__)
#define POSIX_FADV_DONTNEED 6 /* Don't need these pages */
#else
#define POSIX_FADV_DONTNEED 4 /* Don't need these pages */
#endif
#endif
#ifndef SYNC_FILE_RANGE_WAIT_BEFORE
#define SYNC_FILE_RANGE_WAIT_BEFORE 1
#endif
#ifndef SYNC_FILE_RANGE_WRITE
#define SYNC_FILE_RANGE_WRITE 2
#endif
#ifndef SYNC_FILE_RANGE_WAIT_AFTER
#define SYNC_FILE_RANGE_WAIT_AFTER 4
#endif
#define DEVNAME 0
#define DIRNAME 1
#define FILENAME 2
#define RETURN_OK 0
#define RETURN_NG -1
#define FTW_CONT 0
#define FTW_OPEN_FD 2000
#define FS_EXT4 "ext4dev"
#define ROOT_UID 0
#define CHECK_FRAG_COUNT 1
/* Extent status which are used in extent_t */
#define EXT4_EXT_USE 0
#define EXT4_EXT_FREE 1
/* The maximum number of extents for exchanging between
* kernel-space and user-space per ioctl
*/
#define DEFRAG_MAX_ENT 32
/* Move victim extents to make sufficient space */
#define DEFRAG_FORCE_VICTIM 2
/* Magic number for ext4 */
#define EXT4_SUPER_MAGIC 0xEF53
/* Defrag size(64MB) per ioctl(not including force mode) */
#define DEFRAG_SIZE (unsigned long)1 << 26
/* Force defrag mode: Max file size in bytes (128MB) */
#define MAX_FILE_SIZE (unsigned long)1 << 27
/* The following four macros are used for ioctl FS_IOC_FIEMAP
* FIEMAP_FLAG_SYNC: sync file data before map.
* FIEMAP_EXTENT_LAST: last extent in file.
* FIEMAP_MAX_OFFSET: max file offset.
* EXTENT_MAX_COUNT: the maximum number of extents for exchanging between
kernel-space and user-space per ioctl
*/
#define FIEMAP_FLAG_SYNC 0x00000001
#define FIEMAP_EXTENT_LAST 0x00000001
#define FIEMAP_MAX_OFFSET (~0ULL)
#define EXTENT_MAX_COUNT 512
/* The following macros are error message */
#define MSG_USAGE \
"Usage : e4defrag [-v] file...| directory...| device...\n\
: e4defrag -f file [blocknr] \n\
: e4defrag -r directory... | device... \n"
#define MSG_R_OPTION " with regional block allocation mode.\n"
#define NGMSG_MTAB "\te4defrag : Can not access /etc/mtab."
#define NGMSG_UNMOUNT "\te4defrag : FS is not mounted."
#define NGMSG_EXT4 "\te4defrag : FS is not ext4 File System."
#define NGMSG_FS_INFO "\te4defrag : Get FSInfo fail."
#define NGMSG_FILE_INFO "\te4defrag : Get FileInfo fail."
#define NGMSG_FILE_OPEN "\te4defrag : Open fail."
#define NGMSG_FILE_SYNC "\te4defrag : Sync(fsync) fail."
#define NGMSG_FILE_DEFRAG "\te4defrag : Defrag fail."
#define NGMSG_FILE_BLOCKSIZE "\te4defrag : Can't get blocksize."
#define NGMSG_FILE_FIBMAP "\te4defrag : Can't get block number."
#define NGMSG_FILE_UNREG "\te4defrag : File is not regular file."
#define NGMSG_FILE_LARGE \
"\te4defrag : Defrag size is larger than FileSystem's free space."
#define NGMSG_FILE_PRIORITY \
"\te4defrag : File is not current user's file or current user is not root."
#define NGMSG_FILE_LOCK "\te4defrag : File is locked."
#define NGMSG_FILE_BLANK "\te4defrag : File size is 0."
#define NGMSG_GET_LCKINFO "\te4defrag : Get LockInfo fail."
#define NGMSG_TYPE \
"e4defrag : Can not process %s in regional mode.\n"
#define NGMSG_LOST_FOUND "\te4defrag : Can not process \"lost+found\"."
#define NGMSG_REALPATH "\te4defrag : Can not get full path."
#define NGMSG_FILE_MAP "\te4defrag : Get file map fail."
#define NGMSG_FILE_DROP_BUFFER "\te4defrag : Free page fail."
#define NGMSG_FADVISE_SYSCALL "\tFadvise fail."
#define NGMSG_FORCE_DEFRAG_SIZE \
"\te4defrag : Cannot specify a file larger than %luMB in force defrag mode."
/* Data type for filesystem-wide blocks number */
typedef unsigned long long ext4_fsblk_t;
/* Data type for file logical block number */
typedef unsigned int ext4_lblk_t;
/* Data type for block offset of block group */
typedef int ext4_grpblk_t;
struct ext4_extent_data {
ext4_lblk_t block; /* start logical block number */
ext4_fsblk_t start; /* start physical block number */
int len; /* blocks count */
};
/* Used for defrag */
struct ext4_ext_defrag_data {
ext4_lblk_t start_offset; /* start offset to defrag in blocks */
ext4_lblk_t defrag_size; /* size of defrag in blocks */
ext4_fsblk_t goal; /* block offset for allocation */
int flag; /* free space mode flag */
struct ext4_extent_data ext;
};
struct ext4_group_data_info {
int s_blocks_per_group; /* blocks per group */
int s_inodes_per_group; /* inodes per group */
};
struct ext4_extents_info {
unsigned long long ino; /* inode number */
int max_entries; /* maximum extents count */
int entries; /* extent number/count */
ext4_lblk_t f_offset; /* file offset */
ext4_grpblk_t g_offset; /* group offset */
ext4_fsblk_t goal;
struct ext4_extent_data ext[DEFRAG_MAX_ENT];
};
typedef struct extent {
struct extent *prev;
unsigned long tag; /* extent status */
unsigned long ino; /* file's inode number */
struct ext4_extent_data data; /* extent belong to file */
struct extent *next;
} extent_t;
typedef struct exts_group {
struct exts_group *prev;
extent_t *start; /* start ext */
extent_t *end; /* end ext */
int len; /* length of this continuous region */
struct exts_group *next;
} exts_group_t;
struct fiemap_extent {
__u64 fe_logical; /* logical offset in bytes for the start of
* the extent from the beginning of the file */
__u64 fe_physical; /* physical offset in bytes for the start
* of the extent from the beginning
* of the disk */
__u64 fe_length; /* length in bytes for this extent */
__u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */
__u32 fe_device; /* device number for this extent */
};
struct fiemap {
__u64 fm_start; /* logical offset (inclusive) at
* which to start mapping (in) */
__u64 fm_length; /* logical length of mapping which
* userspace wants (in) */
__u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */
__u32 fm_mapped_extents;/* number of extents that were mapped (out) */
__u32 fm_extent_count; /* size of fm_extents array (in) */
__u32 fm_reserved;
struct fiemap_extent fm_extents[0];/* array of mapped extents (out) */
};
struct fiemap_ino {
__u64 ino;
struct fiemap fiemap;
};
int force_flag;
int detail_flag;
int regional_flag;
int amount_cnt;
int succeed_cnt;
char lost_found_dir[PATH_MAX + 1];
ext4_fsblk_t goal;
ext4_fsblk_t fgoal = -1;
/*
* fadvise() - Give advice about file access.
*
* @fd: the file's descriptor.
* @offset: file offset.
* @len: area length.
* @advise: process flag.
*/
int fadvise(int fd, loff_t offset, size_t len, int advise)
{
return syscall(__NR_fadvise64, fd, offset, len, advise);
}
/*
* sync_file_range() - Sync file region.
*
* @fd: the file's descriptor.
* @offset: file offset.
* @length: area length.
* @flag: process flag.
*/
int sync_file_range(int fd, loff_t offset, loff_t length, unsigned int flag)
{
return syscall(__NR_sync_file_range, fd, offset, length, flag);
}
/*
* page_in_core() - Get information on whether pages are in core.
*
* @fd: the file's descriptor.
* @defrag_data: data used for defrag.
* @vec: page state array.
* @page_num: page number.
*/
int page_in_core(int fd, struct ext4_ext_defrag_data defrag_data,
unsigned char **vec, unsigned long *page_num)
{
int blocksize;
int pagesize = getpagesize();
void *page = NULL;
loff_t offset, end_offset, length;
if (vec == NULL || *vec != NULL)
return RETURN_NG;
if (ioctl(fd, FIGETBSZ, &blocksize) < 0)
return RETURN_NG;
/* In mmap, offset should be a multiple of the page size */
offset = defrag_data.start_offset * blocksize;
length = defrag_data.defrag_size * blocksize;
end_offset = offset + length;
/* Round the offset down to the nearest multiple of pagesize */
offset = (offset / pagesize) * pagesize;
length = end_offset - offset;
page = mmap(NULL, length, PROT_READ, MAP_SHARED, fd, offset);
if (page == MAP_FAILED)
return RETURN_NG;
*page_num = 0;
*page_num = (length + pagesize - 1) / pagesize;
*vec = (unsigned char *)calloc(*page_num, 1);
if (*vec == NULL)
return RETURN_NG;
/* Get information on whether pages are in core */
if (mincore(page, (size_t)length, *vec) == -1 ||
munmap(page, length) == -1) {
FREE(*vec);
return RETURN_NG;
}
return RETURN_OK;
}
/*
* defrag_fadvise() - Predeclare an access pattern for file data.
*
* @fd: the file's descriptor.
* @defrag_data: data used for defrag.
* @vec: page state array.
* @page_num: page number.
*/
int defrag_fadvise(int fd, struct ext4_ext_defrag_data defrag_data,
unsigned char *vec, unsigned long page_num)
{
int flag = 1;
int blocksize;
int pagesize = getpagesize();
int fadvise_flag = POSIX_FADV_DONTNEED;
int sync_flag = SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE|
SYNC_FILE_RANGE_WAIT_AFTER;
unsigned long i;
loff_t offset;
if (ioctl(fd, FIGETBSZ, &blocksize) < 0)
return RETURN_NG;
offset = (loff_t)defrag_data.start_offset * blocksize;
offset = (offset / pagesize) * pagesize;
/* Sync file for fadvise process */
if (sync_file_range(fd, offset,
(loff_t)pagesize*page_num, sync_flag) != 0)
return RETURN_NG;
/* Try to release buffer cache which this process used,
* then other process can use the released buffer
*/
for (i = 0; i < page_num; i++) {
if ((vec[i] & 0x1) == 0) {
offset += pagesize;
continue;
}
if (fadvise(fd, offset, pagesize, fadvise_flag) != 0) {
if (detail_flag && flag) {
perror(NGMSG_FADVISE_SYSCALL);
flag = 0;
}
}
offset += pagesize;
}
return RETURN_OK;
}
/*
* check_free_size() - Check if there's enough disk space.
*
* @fd: the file's descriptor.
* @buf: the pointer of the struct stat64.
*/
int check_free_size(int fd, const struct stat64 *buf)
{
off64_t size = 0;
off64_t free_size = 0;
struct statfs fsbuf;
/* Target file size */
size = buf->st_size;
if (fstatfs(fd, &fsbuf) < 0) {
if (detail_flag)
perror(NGMSG_FS_INFO);
return RETURN_NG;
}
/* Compute free space for root and normal user separately */
if (getuid() == ROOT_UID)
free_size = (off64_t)fsbuf.f_bsize * fsbuf.f_bfree;
else
free_size = (off64_t)fsbuf.f_bsize * fsbuf.f_bavail;
if (free_size >= size)
return RETURN_OK;
return RETURN_NG;
}
int file_check(int fd, const struct stat64 *buf, const char *file_name);
int force_defrag(int fd, const struct stat64 *buf, int blocksize);
/*
* file_frag_count() - Get file fragment count.
*
* @fd: the file's descriptor.
*/
long long file_frag_count(int fd)
{
int ret = RETURN_NG;
struct fiemap file_extent_map;
/* When fm_extent_count is 0,
* ioctl just get file fragment count.
*/
memset(&file_extent_map, 0, sizeof(struct fiemap));
file_extent_map.fm_start = 0;
file_extent_map.fm_length = FIEMAP_MAX_OFFSET;
file_extent_map.fm_flags |= FIEMAP_FLAG_SYNC;
ret = ioctl(fd, FS_IOC_FIEMAP, &file_extent_map);
if (ret < 0) {
if (detail_flag)
perror(NGMSG_FILE_INFO);
return RETURN_NG;
}
return file_extent_map.fm_mapped_extents;
}
/*
* ftw_fn() - Check file attributes and ioctl call to avoid.
* illegal operations.
*
* @file: the file's name.
* @buf: the pointer of the struct stat64.
* @flag: file type.
* @ftwbuf: the pointer of a struct FTW.
*/
int ftw_fn(const char *file, const struct stat64 *buf, int flag,
struct FTW *ftwbuf)
{
int fd;
int blocksize;
int percent = 0;
int defraged_size = 0;
int ret = RETURN_NG;
long long file_frags_start, file_frags_end;
unsigned long page_num;
unsigned char *vec = NULL;
loff_t start = 0;
struct ext4_ext_defrag_data df_data;
if (lost_found_dir[0] != '\0' &&
!memcmp(file, lost_found_dir, strnlen(lost_found_dir, PATH_MAX))) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_LOST_FOUND);
PRINT_FILE_NAME(file);
}
return FTW_CONT;
}
if (flag != FTW_F) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_UNREG);
PRINT_FILE_NAME(file);
}
return FTW_CONT;
}
amount_cnt++;
fd = open64(file, O_RDONLY);
if (fd < 0) {
if (detail_flag) {
perror(NGMSG_FILE_OPEN);
PRINT_FILE_NAME(file);
}
return FTW_CONT;
}
if (file_check(fd, buf, file) == RETURN_NG)
goto out;
if (fsync(fd) < 0) {
if (detail_flag) {
perror(NGMSG_FILE_SYNC);
PRINT_FILE_NAME(file);
}
goto out;
}
/* Get blocksize */
if (ioctl(fd, FIGETBSZ, &blocksize) < 0) {
if (detail_flag) {
perror(NGMSG_FILE_BLOCKSIZE);
PRINT_FILE_NAME(file);
}
goto out;
}
/* Ioctl call does the actual defragment job */
df_data.start_offset = 0;
df_data.goal = goal;
df_data.ext.len = 0;
df_data.flag = force_flag;
/* Count file fragments before defrag */
if (detail_flag) {
file_frags_start = file_frag_count(fd);
if (file_frags_start == RETURN_NG) {
PRINT_FILE_NAME(file);
goto out;
}
}
/* Print process progress */
printf("\tprocessing -------> %s:\n", file);
percent = (start * 100) / buf->st_size;
printf("\033[79;16H\033[K progressing ====> %d%%", percent);
fflush(stdout);
while (1) {
df_data.defrag_size = (min((buf->st_size - start),
DEFRAG_SIZE) + blocksize - 1) / blocksize;
ret = page_in_core(fd, df_data, &vec, &page_num);
if (ret == RETURN_NG) {
if (detail_flag) {
perror(NGMSG_FILE_MAP);
PRINT_FILE_NAME(file);
} else {
printf("\n");
}
goto out;
}
/* EXT4_IOC_DEFRAG */
defraged_size = ioctl(fd, EXT4_IOC_DEFRAG, &df_data);
/* Free pages */
ret = defrag_fadvise(fd, df_data, vec, page_num);
if (vec) {
free(vec);
vec = NULL;
}
if (ret == RETURN_NG) {
if (detail_flag) {
perror(NGMSG_FILE_DROP_BUFFER);
PRINT_FILE_NAME(file);
} else {
printf("\n");
}
goto out;
}
/* Go into force defrag mode */
if (defraged_size < 0 && force_flag == 1 && errno == ENOSPC) {
/* File size is larger than max size of
* force defrag mode
*/
if (buf->st_size > MAX_FILE_SIZE) {
fprintf(stderr, NGMSG_FORCE_DEFRAG_SIZE,
(MAX_FILE_SIZE) / (1024 * 1024));
goto out;
}
defraged_size = force_defrag(fd, buf, blocksize);
if (defraged_size * blocksize >= buf->st_size)
/* Whole file is enforcedly defraged */
break;
else
defraged_size = RETURN_NG;
}
if (defraged_size < 0) {
if (detail_flag) {
perror(NGMSG_FILE_DEFRAG);
PRINT_FILE_NAME(file);
} else {
printf("\n");
}
goto out;
}
df_data.start_offset += defraged_size;
start = (long long)df_data.start_offset * blocksize;
/* Print process progress */
percent = (start * 100) / buf->st_size;
/* Disk space file used is bigger than logical size */
printf("\033[79;16H\033[K progressing ====> %d%%",
min(percent, 100));
fflush(stdout);
/* End of file */
if (start >= buf->st_size)
break;
}
/* Count file fragments after defrag and print extents info */
if (detail_flag) {
file_frags_end = file_frag_count(fd);
if (file_frags_end == RETURN_NG) {
PRINT_FILE_NAME(file);
goto out;
}
printf("\n\t\textents: %lld ==> %lld",
file_frags_start, file_frags_end);
}
printf("\n");
succeed_cnt++;
out:
close(fd);
return FTW_CONT;
}
/*
* file_check() - Check file's attributes.
*
* @fd: the file's descriptor.
* @buf: a pointer of the struct stat64.
* @file_name: the file's name.
*/
int file_check(int fd, const struct stat64 *buf, const char *file_name)
{
struct flock lock;
/* Write-lock check is more reliable */
lock.l_type = F_WRLCK;
lock.l_start = 0;
lock.l_whence = SEEK_SET;
lock.l_len = 0;
/* Regular file */
if (S_ISREG(buf->st_mode) == 0) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_UNREG);
PRINT_FILE_NAME(file_name);
}
return RETURN_NG;
}
/* Free space */
if (check_free_size(fd, buf) == RETURN_NG) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_LARGE);
PRINT_FILE_NAME(file_name);
}
return RETURN_NG;
}
/* Priority */
if (getuid() != ROOT_UID &&
buf->st_uid != getuid()) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_PRIORITY);
PRINT_FILE_NAME(file_name);
}
return RETURN_NG;
}
/* Lock status */
if (fcntl(fd, F_GETLK, &lock) < 0) {
if (detail_flag) {
perror(NGMSG_GET_LCKINFO);
PRINT_FILE_NAME(file_name);
}
return RETURN_NG;
} else if (lock.l_type != F_UNLCK) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_LOCK);
PRINT_FILE_NAME(file_name);
}
return RETURN_NG;
}
/* Empty file */
if (buf->st_size == 0) {
if (detail_flag) {
PRINT_ERR_MSG(NGMSG_FILE_BLANK);
PRINT_FILE_NAME(file_name);
}
return RETURN_NG;
}
return RETURN_OK;
}
/*
* is_ext4() - Whether on an ext4 filesystem.
*
* @filename: the file's name.
*/
int is_ext4(const char *filename)
{
int maxlen, len, ret;
FILE *fp = NULL;
char *mnt_type = NULL;
/* Refer to /etc/mtab */
char *mtab = MOUNTED;
char file_path[PATH_MAX + 1];
struct mntent *mnt = NULL;
struct statfs buffs;
/* Get full path */
if (realpath(filename, file_path) == NULL) {
perror(NGMSG_REALPATH);
PRINT_FILE_NAME(filename);
return RETURN_NG;
}
if (statfs(file_path, &buffs) < 0) {
perror(NGMSG_FS_INFO);
PRINT_FILE_NAME(filename);
return RETURN_NG;
}
if (buffs.f_type != EXT4_SUPER_MAGIC) {
PRINT_ERR_MSG(NGMSG_EXT4);
return RETURN_NG;
}
fp = setmntent(mtab, "r");
if (fp == NULL) {
perror(NGMSG_MTAB);
return RETURN_NG;
}
maxlen = 0;
while ((mnt = getmntent(fp)) != NULL) {
len = strlen(mnt->mnt_dir);
ret = memcmp(file_path, mnt->mnt_dir, len);
if (ret != 0)
continue;
if (maxlen >= len)
continue;
maxlen = len;
mnt_type = realloc(mnt_type, strlen(mnt->mnt_type) + 1);
if (!mnt_type) {
endmntent(fp);
return RETURN_NG;
}
strcpy(mnt_type, mnt->mnt_type);
strncpy(lost_found_dir, mnt->mnt_dir, PATH_MAX);
}
endmntent(fp);
if (strcmp(mnt_type, FS_EXT4) == 0) {
FREE(mnt_type);
return RETURN_OK;
} else {
FREE(mnt_type);
PRINT_ERR_MSG(NGMSG_EXT4);
return RETURN_NG;
}
}
/*
* get_mount_point() - Get device's mount point.
*
* @devname: the device's name.
* @mount_point: the mount point.
* @dir_path_len: the length of directory.
*/
int get_mount_point(const char *devname, char *mount_point,
int dir_path_len)
{
/* Refer to /etc/mtab */
char *mtab = MOUNTED;
FILE *fp = NULL;
struct mntent *mnt = NULL;
fp = setmntent(mtab, "r");
if (fp == NULL) {
perror(NGMSG_MTAB);
return RETURN_NG;
}
while ((mnt = getmntent(fp)) != NULL) {
if (strcmp(devname, mnt->mnt_fsname) != 0)
continue;
endmntent(fp);
if (strcmp(mnt->mnt_type, FS_EXT4) == 0) {
strncpy(mount_point, mnt->mnt_dir,
dir_path_len);
return RETURN_OK;
}
PRINT_ERR_MSG(NGMSG_EXT4);
return RETURN_NG;
}
endmntent(fp);
PRINT_ERR_MSG(NGMSG_UNMOUNT);
return RETURN_NG;
}
/*
* main() - ext4 online defrag.
*
* @argc: the number of parameter.
* @argv[]: the pointer array of parameter.
*/
int main(int argc, char *argv[])
{
int fd;
int ret;
int opt;
int i, flags;
int arg_type;
int detail_tmp;
int success_flag;
char dir_name[PATH_MAX + 1];
struct stat64 buf;
i = 1;
flags = 0;
arg_type = -1;
detail_tmp = -1;
success_flag = 0;
/* Do not follow symlink */
flags |= FTW_PHYS;
/* Stay within the same filesystem */
flags |= FTW_MOUNT;
/* Parse arguments */
if (argc == 1 || (argc == 2 && argv[1][0] == '-'))
goto out;
while ((opt = getopt(argc, argv, "rvf")) != EOF) {
switch (opt) {
case 'r':
regional_flag = 1;
i = 2;
break;
case 'v':
detail_flag = 1;
i = 2;
break;
case 'f':
force_flag = 1;
i = 2;
if (argc == 3)
break;
if (argc > 4) {
printf("Illegal argument\n");
goto out;
}
/* Now the agrc must be 4(e4defrag -f file blocknr) */
int res_strlen;
res_strlen = strlen(argv[3]);
for (res_strlen -= 1; res_strlen >= 0; res_strlen--) {
if (!isdigit(argv[3][res_strlen])) {
printf("Illegal argument\n");
goto out;
}
}
fgoal = strtoul(argv[3], NULL, 0);
if (errno) {
printf("block num shold be < 4294967295"
"(max num of unsigned long 32bit)\n");
exit(1);
}
if (!fgoal)
fgoal = -1;
break;
default:
goto out;
}
}
/* Main process */
for (; i < argc; i++) {
amount_cnt = 0;
succeed_cnt = 0;
memset(dir_name, 0, PATH_MAX + 1);
memset(lost_found_dir, 0, PATH_MAX + 1);
if (force_flag && i == 3)
break;
if (lstat64(argv[i], &buf) < 0) {
perror(NGMSG_FILE_INFO);
PRINT_FILE_NAME(argv[i]);
continue;
}
/* Only regular file is acceptalbe with force defrag mode */
if (force_flag && !S_ISREG(buf.st_mode)) {
printf("Inappropriate file type\n");
goto out;
}
if (S_ISBLK(buf.st_mode)) {
/* Block device */
if (get_mount_point(argv[i], dir_name, PATH_MAX)
== RETURN_NG)
continue;
arg_type = DEVNAME;
printf("Start defragment for device(%s)\n", argv[i]);
} else if (S_ISDIR(buf.st_mode)) {
/* Directory */
if (access(argv[i], R_OK) < 0) {
perror(argv[i]);
continue;
}
arg_type = DIRNAME;
strcpy(dir_name, argv[i]);
} else if (S_ISREG(buf.st_mode)) {
/* Regular file */
arg_type = FILENAME;
} else {
/* Irregular file */
PRINT_ERR_MSG(NGMSG_FILE_UNREG);
PRINT_FILE_NAME(argv[i]);
continue;
}
/* For device case,
* filesystem type checked in get_mount_point()
*/
if (arg_type == FILENAME || arg_type == DIRNAME) {
if (is_ext4(argv[i]) == RETURN_NG)
continue;
if (realpath(argv[i], dir_name) == NULL) {
perror(NGMSG_REALPATH);
PRINT_FILE_NAME(argv[i]);
continue;
}
}
switch (arg_type) {
case DIRNAME:
printf("Start defragment for directory(%s)\n",
argv[i]);
int mount_dir_len = 0;
mount_dir_len = strnlen(lost_found_dir, PATH_MAX);
strncat(lost_found_dir, "/lost+found",
PATH_MAX - strnlen(lost_found_dir, PATH_MAX));
/* Not the case("e4defrag mount_piont_dir") */
if (dir_name[mount_dir_len] != '\0') {
/* "e4defrag mount_piont_dir/lost+found"
* or "e4defrag mount_piont_dir/lost+found/"
*/
if (strncmp(lost_found_dir, dir_name,
strnlen(lost_found_dir,
PATH_MAX)) == 0 &&
(dir_name[strnlen(lost_found_dir,
PATH_MAX)] == '\0' ||
dir_name[strnlen(lost_found_dir,
PATH_MAX)] == '/')) {
PRINT_ERR_MSG(NGMSG_LOST_FOUND);
PRINT_FILE_NAME(argv[i]);
continue;
}
/* "e4defrag mount_piont_dir/else_dir" */
memset(lost_found_dir, 0, PATH_MAX + 1);
}
case DEVNAME:
if (arg_type == DEVNAME) {
strncpy(lost_found_dir, dir_name,
strnlen(dir_name, PATH_MAX));
strncat(lost_found_dir, "/lost+found/",
PATH_MAX - strnlen(lost_found_dir,
PATH_MAX));
}
/* Regional block allocation */
if (regional_flag) {
printf(MSG_R_OPTION);
fd = open64(dir_name, O_RDONLY);
if (fd < 0) {
if (detail_flag) {
perror(NGMSG_FILE_OPEN);
PRINT_FILE_NAME(dir_name);
}
continue;
}
goal = 0;
if ((ret = ioctl(fd, EXT4_IOC_FIBMAP,
&goal)) != 0) {
perror(NGMSG_FILE_FIBMAP);
PRINT_FILE_NAME(dir_name);
close(fd);
continue;
}
close(fd);
}
/* File tree walk */
nftw64(dir_name, ftw_fn, FTW_OPEN_FD, flags);
printf("\tTotal:\t\t%12d\n", amount_cnt);
printf("\tSuccess:\t%12d\n", succeed_cnt);
printf("\tFailure:\t%12d\n",
amount_cnt - succeed_cnt);
break;
case FILENAME:
strncat(lost_found_dir, "/lost+found/",
PATH_MAX - strnlen(lost_found_dir,
PATH_MAX));
if (strncmp(lost_found_dir, dir_name,
strnlen(lost_found_dir,
PATH_MAX)) == 0) {
PRINT_ERR_MSG(NGMSG_LOST_FOUND);
PRINT_FILE_NAME(argv[i]);
continue;
}
if (regional_flag) {
fprintf(stderr, NGMSG_TYPE, argv[i]);
continue;
}
detail_tmp = detail_flag;
detail_flag = 1;
printf("Start defragment for %s\n", argv[i]);
/* Defrag single file process */
ftw_fn(argv[i], &buf, FTW_F, NULL);
if (succeed_cnt != 0)
printf("\tSUCCESS\t:file defrag success.\n");
detail_flag = detail_tmp;
break;
}
if (succeed_cnt != 0)
success_flag = 1;
}
if (success_flag)
return RETURN_OK;
exit(1);
out:
printf(MSG_USAGE);
exit(1);
}
/*
* insert_extent() - Sequentially insert extent by physical block number.
*
* @extlist_head: the head of an extent list.
* @ext: the extent element which will be inserted.
*/
int insert_extent(extent_t **extlist_head, extent_t *ext)
{
extent_t *ext_tmp = *extlist_head;
if (ext == NULL)
return RETURN_NG;
/* First element */
if (*extlist_head == NULL) {
(*extlist_head) = ext;
(*extlist_head)->prev = *extlist_head;
(*extlist_head)->next = *extlist_head;
return RETURN_OK;
}
if (ext->data.start <= ext_tmp->data.start) {
/* Insert before head */
if (ext_tmp->data.start < ext->data.start + ext->data.len)
/* Overlap */
return RETURN_NG;
/* Adjust head */
*extlist_head = ext;
} else {
/* Insert into the middle or last of the list */
do {
if (ext->data.start < ext_tmp->data.start)
break;
ext_tmp = ext_tmp->next;
} while (ext_tmp != (*extlist_head));
if (ext->data.start <
ext_tmp->prev->data.start + ext_tmp->prev->data.len)
/* Overlap */
return RETURN_NG;
if (ext_tmp != *extlist_head &&
ext_tmp->data.start < ext->data.start + ext->data.len)
/* Overlap */
return RETURN_NG;
}
ext_tmp = ext_tmp->prev;
/* Insert "ext" after "ext_tmp" */
insert(ext_tmp, ext);
return RETURN_OK;
}
/*
* insert_exts_group() - Insert a exts_group in decreasing order
* of length.
*
* @exts_group_list_head: the head of a exts_group list.
* @exts_group: the exts_group element which will be inserted.
*/
int insert_exts_group(exts_group_t **exts_group_list_head,
exts_group_t *exts_group)
{
exts_group_t *exts_group_tmp = NULL;
if (exts_group == NULL)
return RETURN_NG;
/* Initialize list */
if (*exts_group_list_head == NULL) {
(*exts_group_list_head) = exts_group;
(*exts_group_list_head)->prev = *exts_group_list_head;
(*exts_group_list_head)->next = *exts_group_list_head;
return RETURN_OK;
}
if (exts_group->len >= (*exts_group_list_head)->len) {
/* Insert before exts_group_list_head */
exts_group_tmp = (*exts_group_list_head)->prev;
insert(exts_group_tmp, exts_group);
*exts_group_list_head = exts_group;
return RETURN_OK;
}
/* Find insertion positon */
for (exts_group_tmp = (*exts_group_list_head)->next;
exts_group_tmp != *exts_group_list_head;
exts_group_tmp = exts_group_tmp->next) {
if (exts_group_tmp->len < exts_group->len)
break;
}
exts_group_tmp = exts_group_tmp->prev;
insert(exts_group_tmp, exts_group);
return RETURN_OK;
}
/*
* get_exts_group() - Get element from the exts_group list.
*
* @exts_group_list_head: the head of a exts_group list.
* @exts_group: the exts_group element which will be got.
*/
exts_group_t *get_exts_group(exts_group_t **exts_group_list_head,
exts_group_t *exts_group)
{
if (exts_group == NULL || *exts_group_list_head == NULL)
return NULL;
/* Keep "exts_group_list_head" point to the largest extent group */
if (exts_group == *exts_group_list_head)
*exts_group_list_head = exts_group->next;
if (*exts_group_list_head == (*exts_group_list_head)->next &&
exts_group == *exts_group_list_head)
/* Delete the last element in the list */
*exts_group_list_head = NULL;
exts_group->prev->next = exts_group->next;
exts_group->next->prev = exts_group->prev;
return exts_group;
}
/*
* free_exts_group() - Free the exts_group.
*
* @*exts_group_list_head: the exts_group list head which will be free.
*/
void free_exts_group(exts_group_t *exts_group_list_head)
{
exts_group_t *exts_group_tmp = NULL;
if (exts_group_list_head == NULL)
return;
while (exts_group_list_head->next != exts_group_list_head) {
exts_group_tmp = exts_group_list_head;
exts_group_list_head->prev->next = exts_group_list_head->next;
exts_group_list_head->next->prev = exts_group_list_head->prev;
exts_group_list_head = exts_group_list_head->next;
free(exts_group_tmp);
}
free(exts_group_list_head);
}
/*
* free_ext() - Free the extent list.
*
* @extent_list_head: the extent list head of which will be free.
*/
void free_ext(extent_t *extent_list_head)
{
extent_t *extent_tmp = NULL;
if (extent_list_head == NULL)
return;
while (extent_list_head->next != extent_list_head) {
extent_tmp = extent_list_head;
extent_list_head->prev->next = extent_list_head->next;
extent_list_head->next->prev = extent_list_head->prev;
extent_list_head = extent_list_head->next;
free(extent_tmp);
}
free(extent_list_head);
}
/*
* do_defrag() - Execute the defrag program in force mode.
*
* @fd: the file's descriptor.
* @exts_group: the exts_group which will be defraged.
* @defrag_data: the data which will be defraged.
*/
int do_defrag(int fd, exts_group_t *exts_group,
struct ext4_ext_defrag_data defrag_data)
{
int defraged_size = 0;
int fadvise_ret = 0;
unsigned long page_num;
unsigned char *vec = NULL;
/* Init defrag_data for defrag */
defrag_data.ext.start = exts_group->start->data.start;
defrag_data.ext.len = exts_group->len;
defrag_data.ext.block = 0;
defrag_data.defrag_size = exts_group->len;
/* Move victim extents to make sufficient space */
defrag_data.flag = DEFRAG_FORCE_VICTIM;
defrag_data.goal = exts_group->start->data.start;
if (page_in_core(fd, defrag_data, &vec, &page_num) == RETURN_NG)
return RETURN_NG;
defraged_size = ioctl(fd, EXT4_IOC_DEFRAG, &defrag_data);
/* Free pages */
fadvise_ret = defrag_fadvise(fd, defrag_data, vec, page_num);
FREE(vec);
if (fadvise_ret == RETURN_NG || defraged_size < 0)
return RETURN_NG;
return defraged_size;
}
/*
* get_used_extent() - Get used extent in the block group.
*
* @fd: the file's descriptor.
* @ext_list_head: the head of the extent list.
* @istart: start inode in the block group.
* @iend: end inode in the block group.
* @bstart: start block in the block group.
* @bend: end block in the block group.
*/
int get_used_extent(int fd, extent_t **ext_list_head,
unsigned long long istart, unsigned long long iend,
ext4_fsblk_t bstart, ext4_fsblk_t bend)
{
int ret = 0;
int blocksize;
int extents_buffer_size, fiemap_ino_size;
__u64 pos = 0;
__u64 group_start, group_end;
unsigned long long ino;
struct fiemap_extent *extens_buf = NULL;
struct fiemap_ino *fiemap_ino_buf = NULL;
ret = ioctl(fd, FIGETBSZ, &blocksize);
if (ret < 0) {
if (detail_flag)
perror(NGMSG_FILE_BLOCKSIZE);
return RETURN_NG;
}
/* Convert units, in bytes.
* Be careful : now, physical block number in extent is 48bit,
* and the maximum blocksize for ext4 is 4K(12bit),
* so there is no overflow, but in future it may be changed.
*/
group_start = bstart * blocksize;
group_end = bend * blocksize;
/* Alloc space for fiemap_ino */
fiemap_ino_size = sizeof(struct fiemap_ino);
extents_buffer_size = EXTENT_MAX_COUNT * sizeof(struct fiemap_extent);
fiemap_ino_buf = malloc(fiemap_ino_size + extents_buffer_size);
if (!fiemap_ino_buf)
return RETURN_NG;
extens_buf = fiemap_ino_buf->fiemap.fm_extents;
memset(fiemap_ino_buf, 0, fiemap_ino_size);
fiemap_ino_buf->fiemap.fm_length = FIEMAP_MAX_OFFSET;
fiemap_ino_buf->fiemap.fm_flags |= FIEMAP_FLAG_SYNC;
fiemap_ino_buf->fiemap.fm_extent_count = EXTENT_MAX_COUNT;
for (ino = istart; ino <= iend; ino++) {
fiemap_ino_buf->ino = ino;
pos = 0;
do {
int i;
fiemap_ino_buf->fiemap.fm_start = pos;
memset(extens_buf, 0, extents_buffer_size);
ret = ioctl(fd, EXT4_IOC_FIEMAP_INO, fiemap_ino_buf);
if (ret < 0) {
/* Skip non-regular file and unused inode */
if (errno == EOPNOTSUPP || errno == ESTALE
|| errno == ENOENT)
continue;
goto out;
}
for (i = 0; i < fiemap_ino_buf->
fiemap.fm_mapped_extents; i++) {
extent_t *extent = NULL;
/* Is this extent in current block group ? */
if (extens_buf[i].fe_physical < group_start ||
extens_buf[i].fe_physical > group_end)
continue;
extent = malloc(sizeof(extent_t));
if (extent == NULL)
goto out;
extent->data.start = extens_buf[i].fe_physical /
blocksize;
extent->data.block = extens_buf[i].fe_logical /
blocksize;
extent->data.len = extens_buf[i].fe_length /
blocksize;
extent->ino = ino;
extent->tag = EXT4_EXT_USE;
if (insert_extent(ext_list_head, extent) < 0) {
FREE(extent);
goto out;
}
}
/* Record file's logical offset this time */
pos = extens_buf[EXTENT_MAX_COUNT-1].fe_logical +
extens_buf[EXTENT_MAX_COUNT-1].fe_length;
/* If fm_extents array has been filled and
* there are extents left, continue to cycle.
*/
} while (fiemap_ino_buf->fiemap.fm_mapped_extents
== EXTENT_MAX_COUNT &&
!(extens_buf[EXTENT_MAX_COUNT-1].fe_flags
& FIEMAP_EXTENT_LAST));
}
FREE(fiemap_ino_buf);
return RETURN_OK;
out:
FREE(fiemap_ino_buf);
return RETURN_NG;
}
/*
* get_free_extent() - Get used extent in the block group.
*
* @fd: the file's descriptor.
* @ino: inode number from struct stat64.
* @blocks_per_group: the block number of each block group.
* @ext_list_head: the head of the extent list.
*/
int get_free_extent(int fd, unsigned long long ino,
int blocks_per_group, extent_t **ext_list_head)
{
ext4_grpblk_t pos = 0;
struct ext4_extents_info extents_info;
memset(&extents_info, 0, sizeof(struct ext4_extents_info));
extents_info.ino = ino;
extents_info.max_entries = DEFRAG_MAX_ENT;
while (pos < blocks_per_group) {
int i;
if (ioctl(fd, EXT4_IOC_FREE_BLOCKS_INFO, &extents_info) < 0)
return RETURN_NG;
for (i = 0;
extents_info.ext[i].len != 0 && i < DEFRAG_MAX_ENT; i++) {
/* Alloc space for extent */
extent_t *extent = NULL;
extent = malloc(sizeof(extent_t));
if (extent == NULL)
return RETURN_NG;
memset(extent, 0, sizeof(extent_t));
memcpy(&(extent->data), &(extents_info.ext[i]),
sizeof(struct ext4_extent_data));
/* Free extent */
extent->tag = EXT4_EXT_FREE;
if (insert_extent(ext_list_head, extent) < 0) {
FREE(extent);
return RETURN_NG;
}
}
/* No free extent after the logical block number "pos".
* In other word, offset this time equals to prev recursion.
*/
if (pos == extents_info.g_offset)
break;
if (i < DEFRAG_MAX_ENT)
break;
/* Record the offset of logical block number this time */
pos = extents_info.g_offset;
memset(extents_info.ext, 0,
sizeof(struct ext4_extent_data) * DEFRAG_MAX_ENT);
}
return RETURN_OK;
}
/*
* join_extents() - Find continuous region(exts_group).
*
* @ext_list_head: the head of the extent list.
* @target_exts_group_list_head:the head of the target exts_group list.
* @exts_group_list_head: the head of the original exts_group list.
* @filesize: the file's descriptor.
* @max: the max size of free space.
*/
int join_extents(extent_t *ext_list_head,
exts_group_t **target_exts_group_list_head,
exts_group_t **exts_group_list_head,
unsigned long filesize, int *max)
{
int len;
extent_t *ext_start, *extent_tmp;
ext_start = ext_list_head;
extent_tmp = ext_list_head;
*max = 0;
len = ext_list_head->data.len;
extent_tmp = extent_tmp->next;
do {
exts_group_t *exts_group_tmp = NULL;
if (len >= filesize) {
/* Hit on the way,
* one extent group is enough for defrag, so return.
*/
exts_group_tmp = malloc(sizeof(exts_group_t));
if (!exts_group_tmp)
return RETURN_NG;
exts_group_tmp->prev = NULL;
exts_group_tmp->next = NULL;
exts_group_tmp->start = ext_start;
exts_group_tmp->end = extent_tmp->prev;
exts_group_tmp->len = len;
if (insert_exts_group(target_exts_group_list_head,
exts_group_tmp) < 0) {
FREE(exts_group_tmp);
return RETURN_NG;
}
return CHECK_FRAG_COUNT;
}
/* This extent and previous extent are not continuous,
* so, all previous extents are treated as an extent group.
*/
if ((extent_tmp->prev->data.start + extent_tmp->prev->data.len)
!= extent_tmp->data.start) {
exts_group_tmp = malloc(sizeof(exts_group_t));
if (exts_group_tmp == NULL)
return RETURN_NG;
memset(exts_group_tmp, 0, sizeof(exts_group_t));
exts_group_tmp->len = len;
exts_group_tmp->start = ext_start;
exts_group_tmp->end = extent_tmp->prev;
if (insert_exts_group(exts_group_list_head,
exts_group_tmp) < 0) {
FREE(exts_group_tmp);
return RETURN_NG;
}
*max += len;
ext_start = extent_tmp;
len = extent_tmp->data.len;
extent_tmp = extent_tmp->next;
continue;
}
/* This extent and previous extent are continuous,
* so, they belong to the same extent group, and we check
* if the next extent belongs to the same extent group.
*/
len += extent_tmp->data.len;
extent_tmp = extent_tmp->next;
} while (extent_tmp != ext_list_head->next);
return RETURN_OK;
}
/*
* find_exts_group() - Find target exts_group.
*
* @ext_count: the number of extents.
* @filesize: the file's size.
* @exts_group_list_head: the head of the original exts_group list
* @target_exts_group_list_head: the head of the target exts_group list.
*/
int find_exts_group(int *ext_count, unsigned long filesize,
exts_group_t **exts_group_list_head,
exts_group_t **target_exts_group_list_head)
{
/* Blocks we found for target file */
int len = 0;
if (!(*exts_group_list_head))
return RETURN_NG;
while (*exts_group_list_head) {
exts_group_t *exts_group_tmp = NULL;
/* Even add the current largest extent group,
* the sapce we found is still not enough for the file,
* so just add the current largest extent group,
* and do the next loop.
*/
if ((*exts_group_list_head)->len + len < filesize) {
len += (*exts_group_list_head)->len;
exts_group_tmp = get_exts_group(exts_group_list_head,
*exts_group_list_head);
if (insert_exts_group(target_exts_group_list_head,
exts_group_tmp) < 0) {
FREE(exts_group_tmp);
return RETURN_NG;
}
(*ext_count)++;
continue;
}
/* Now, if add the current largest extent group,
* the space we found is enough,
* So, search from the smallest extent group
* to avoid waste of space
*/
exts_group_tmp = (*exts_group_list_head)->prev;
do {
if (exts_group_tmp->len + len >= filesize) {
len += exts_group_tmp->len;
exts_group_tmp =
get_exts_group(exts_group_list_head,
exts_group_tmp);
if (insert_exts_group
(target_exts_group_list_head,
exts_group_tmp) < 0) {
FREE(exts_group_tmp);
return RETURN_NG;
}
(*ext_count)++;
/* The only entry go out normally */
return RETURN_OK;
}
exts_group_tmp = exts_group_tmp->prev;
} while (exts_group_tmp !=
(*exts_group_list_head)->prev);
/* If we come here, there must be something wrong */
return RETURN_NG;
}
/* If we come here, there must be something wrong(space not enough) */
return RETURN_NG;
}
/*
* check_frag_count() - Check file frag.
*
* @fd: the file's discriptor.
* @extent_count: the number of extents.
*/
int check_frag_count(int fd, int extent_count)
{
long long file_extent_count = RETURN_NG;
file_extent_count = file_frag_count(fd);
if (file_extent_count == RETURN_NG)
return RETURN_NG;
if (extent_count >= file_extent_count) {
/* No improvment */
errno = ENOSPC;
return RETURN_NG;
}
return RETURN_OK;
}
/*
* defrag_proc() - Reserve extent group and execute
* the defrag program.
*
* @fd: the file's discriptor.
* @target_exts_group_head: the head of the original exts_group list.
* @ino: inode number from struct stat64.
*/
int defrag_proc(int fd, exts_group_t *target_exts_group_head,
unsigned long long ino)
{
int ret = 0;
int percent = 0;
int blocksize = 0;
struct stat64 buf;
exts_group_t *exts_group = NULL;
extent_t *extent = NULL;
struct ext4_extents_info extents_info;
struct ext4_ext_defrag_data defrag_data;
if (!target_exts_group_head)
return RETURN_NG;
/* Get file size */
memset(&buf, 0, sizeof(struct stat64));
ret = fstat64(fd, &buf);
if (ret < 0) {
perror(NGMSG_FILE_INFO);
return RETURN_NG;
}
/* Get block size */
ret = ioctl(fd, FIGETBSZ, &blocksize);
if (ret < 0) {
perror(NGMSG_FILE_BLOCKSIZE);
return RETURN_NG;
}
memset(&extents_info, 0, sizeof(extents_info));
memset(&defrag_data, 0, sizeof(struct ext4_ext_defrag_data));
extents_info.ino = 0;
exts_group = target_exts_group_head;
extents_info.max_entries = DEFRAG_MAX_ENT;
extents_info.ino = ino;
defrag_data.start_offset = 0;
do {
/* Move victim extents to make sufficient space */
extent = exts_group->start;
do {
if (extent->tag != EXT4_EXT_USE) {
extent = extent->next;
continue;
}
extents_info.ino = extent->ino;
extents_info.goal = fgoal;
memcpy(extents_info.ext, &extent->data,
sizeof(struct ext4_extent_data));
extent = extent->next;
extents_info.entries = 1;
ret = ioctl(fd, EXT4_IOC_MOVE_VICTIM, &extents_info);
if (ret < 0)
goto release_blocks;
} while (extent != exts_group->end->next);
if (fsync(fd) < 0) {
if (detail_flag)
perror(NGMSG_FILE_SYNC);
return ret;
}
/* Init extents_info for ioctl (RESERVE) */
extents_info.entries = 1;
extents_info.ext[0].block = exts_group->start->data.block;
extents_info.ext[0].start = exts_group->start->data.start;
extents_info.ext[0].len = exts_group->len;
ret = ioctl(fd, EXT4_IOC_RESERVE_BLOCK, &extents_info);
if (ret < 0) {
printf("RESERVE_ERROR ret = %d\n", ret);
printf("block is already used\n");
goto release_blocks;
}
/* Defrag */
ret = do_defrag(fd, exts_group, defrag_data);
if (ret < 0) {
printf("DEFRAG_ERROR ret = %d\n", ret);
goto release_blocks;
}
/* Defrag success, so update offset */
defrag_data.start_offset += ret;
ret = defrag_data.start_offset;
/* Print process progress */
if (detail_flag) {
percent = ((long long)ret * blocksize * 100) /
buf.st_size;
printf("\033[79;16H\033[K progressing ====> %d%%",
min(percent, 100));
fflush(stdout);
}
exts_group = exts_group->next;
} while (exts_group != target_exts_group_head);
return ret;
release_blocks:
ret = ioctl(fd, EXT4_IOC_BLOCK_RELEASE);
if (ret < 0)
return RETURN_NG;
return ret;
}
/*
* force_defrag() - Execute the defrag program in force defrag mode.
*
* @fd: the file's descriptor.
* @buf: a pointer of the struct stat64.
* @blocksize: block size in byte.
*/
int force_defrag(int fd, const struct stat64 *buf, int blocksize)
{
int ret = 0;
int exts = 0;
int maxlen = 0;
unsigned int gnumber;
unsigned long filesize;
unsigned long long istart, iend;
ext4_fsblk_t bstart, bend;
extent_t *extlist_head = NULL;
exts_group_t *exts_group_list_head, *exts_group_list_target_head;
struct ext4_group_data_info ext4_group_data;
exts_group_list_head = NULL;
exts_group_list_target_head = NULL;
/* Get group info */
memset(&ext4_group_data, 0, sizeof(struct ext4_group_data_info));
if (ioctl(fd, EXT4_IOC_GROUP_INFO, &ext4_group_data) < 0)
return RETURN_NG;
gnumber = (buf->st_ino - 1) / ext4_group_data.s_inodes_per_group;
istart = gnumber * ext4_group_data.s_inodes_per_group;
iend = istart + ext4_group_data.s_inodes_per_group - 1;
bstart = gnumber * ext4_group_data.s_blocks_per_group;
bend = bstart + ext4_group_data.s_blocks_per_group - 1;
/* Compute filesize in block */
filesize = (buf->st_size + blocksize - 1) / blocksize;
/* Get used extents in the block group */
ret = get_used_extent(fd, &extlist_head, istart, iend, bstart, bend);
if (ret == RETURN_NG)
goto freelist;
/* Get free extents in the group */
ret = get_free_extent(fd, buf->st_ino,
ext4_group_data.s_blocks_per_group, &extlist_head);
if (ret == RETURN_NG)
goto freelist;
/* All space in this group is used by other groups' inodes */
if (extlist_head == NULL) {
ret = RETURN_NG;
goto freelist;
}
/* Get continuous region(extents group) */
ret = join_extents(extlist_head, &exts_group_list_target_head,
&exts_group_list_head, filesize, &maxlen);
if (ret == RETURN_NG)
goto freelist;
if (ret == CHECK_FRAG_COUNT) {
exts = 1;
goto frag_check;
}
if (maxlen < filesize) {
/* No enough space */
errno = ENOSPC;
ret = RETURN_NG;
goto freelist;
}
if (!exts_group_list_head) {
ret = RETURN_NG;
goto freelist;
}
/* Find target extents group */
ret = find_exts_group(&exts, filesize, &exts_group_list_head,
&exts_group_list_target_head);
if (ret == RETURN_NG)
goto freelist;
frag_check:
/* Check file extent count */
ret = check_frag_count(fd, exts);
if (ret == RETURN_NG)
goto freelist;
/* Reserve extent group and execute the defrag program */
ret = defrag_proc(fd, exts_group_list_target_head, buf->st_ino);
freelist:
free_exts_group(exts_group_list_target_head);
free_exts_group(exts_group_list_head);
free_ext(extlist_head);
return ret;
}
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists